Preheat your oven to 350°F (175°C). Grease and line an 8-inch square baking pan with parchment paper, leaving some overhang for easy removal.
In a large mixing bowl, whisk together the glutinous rice flour, granulated sugar, cocoa powder, baking powder, and salt until well combined.
In another bowl, whisk the milk, vegetable oil, eggs, and vanilla extract together until smooth.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Be careful not to over-mix; a few lumps are okay.
Fold in the semi-sweet chocolate chips, ensuring they are evenly distributed throughout the batter.
Pour the batter into the prepared baking pan, smoothing the top with a spatula.
Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Once baked, remove from the oven and let it cool in the pan for about 10 minutes. Then, lift the brownies out using the parchment overhang and transfer them to a wire rack to cool completely.
Once cooled, dust with powdered sugar if desired, and cut into squares.
Notes
Serve with fresh berries or mint leaves for garnish and a scoop of vanilla ice cream for an indulgent treat.